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Parts being manufactured at a plant are supposed to weigh 40 grams. Suppose the distribution of weights has a Normal distribution with mean 40 grams and a standard deviation 2 grams. Quality control inspectors randomly select 16 parts, weigh each, and then compute the sample average weight for the 16 parts. The probability that the mean weight of these 16 parts is more than 41 grams or less than 39 grams is?
If the researcher deems the data to be statistically significant, which of the following is true with respect to a conclusion reached?
An auditor for Health Maintenance Services of Georgia reports 40% of policyholders 55 years or older submit a claim during the year. Fifteen policyholders are randomly selected for company records.
The mean age of school bus drivers in Denver is claimed to be 56.9 years. A hypothesis test is performed at a level of significance of 0.05 with a P-value of 0.03. Choose the best interpretation of the hypothesis test.
Let p vary from 0.02 to 0.20 in increments of 0.02. b) Sketch the graph of the probabilities of the lot acceptance as the p value varies from 0.02 to 0.20.
Assume independent events. Why might the assumption of independence be violated? (b) Why might a driver be tempted not to use a seat belt "just on this trip"?
What is the probability of finding exactly four watch soap operas?
x1 = 100 and x2 = 127 successes were observed. What is the best point estimator for the difference ( p1-p2) in the two binomial proportions?
You are working on an analysis of your company's current cost structure reviewing the various fixed and variable costs within your firm. Your objective is to maximize your firms profit.
21 percent of the employees in a company have managerial positions, and 31 percent of the employees in the company have MBA degrees. Also, 66 percent of the managers have MBA degrees. Using the probability formulas, find the proportion of employee..
Explain why comparing children whose parents chose a Montessori school with children of other parents would not show whether Montessori schools perform better than other programs?
For each question, state whether the data collected are categorical or quantitative and indicate the measurement scale being used. What is the current Mileage?
What was the probability that a student worked a part time job or made the Dean's list. Interpret the results.
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